In a four-way horse race, Clinton gets support from 43 percent of likely voters and Trump gets 37 percent

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Democratic presidential nominee Hillary Clinton leads Republican Donald Trump by 6 points among likely voters heading into the first presidential debate on Monday, according to a new NBC News/Wall Street Journal poll.

The survey, conducted after Clinton's return to the campaign trail following her bout with pneumonia, shows a bigger advantage for the secretary of state than did polls taken during the heightened scrutiny of her health.

"Despite arguably the worst few weeks of her candidacy, the fundamentals still point toward a Hillary Clinton victory," says Democratic pollster Fred Yang of Hart Research Associates, who conducted the survey with Republican pollster Bill McInturff of Public Opinion Strategies.

In a four-way horse race, Clinton gets support from 43 percent of likely voters and Trump gets 37 percent, while Libertarian nominee Gary Johnson is at 9 percent and the Green Party's Jill Stein is at 3 percent.